Towards a Self-Starting All-Fibre All-Normal Dispersion Mamyshev Oscillator in the 2 μm Band

All-fibre ultrafast lasers are renowned for their maintenance-free, cost-effective operation. Nevertheless, a range of applications beyond standard wavelengths (1-1.5 μm) are not feasible since reduced efficiency of saturable absorbers. Bright examples are Thulium-doped fibre lasers, which are in great demand for biomedical treatments or free-space transmissions. One solution can be an easily adaptable Mamyshev oscillator (MO), which mitigates restrictions of conventional modulators and has brought on record performances for fibre lasers [1]. Though, a major challenge of MOs and a prerequisite for use in real-world applications is a reliable self-starting. Current works have introduced so far only a pulse-seeded, free-space MO in the 2 μm band [2].